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sf: Update sf to support all sizes of flashes

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Updated the spi_flash framework to handle all sizes of flashes
using bank/extd addr reg facility

The current implementation in spi_flash supports 3-byte address mode
due to this up to 16Mbytes amount of flash is able to access for those
flashes which has an actual size of > 16MB.

As most of the flashes introduces a bank/extd address registers
for accessing the flashes in 16Mbytes of banks if the flash size
is > 16Mbytes, this new scheme will add the bank selection feature
for performing write/erase operations on all flashes.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Jagannadha Sutradharudu Teki 2013-05-30 20:24:14 +05:30
parent e612ddf593
commit e3ff9d51ec
1 changed files with 26 additions and 13 deletions
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39
drivers/mtd/spi/spi_flash.c
View File

@ -74,11 +74,9 @@ int spi_flash_cmd_write_multi(struct spi_flash *flash, u32 offset,
unsigned long page_addr, byte_addr, page_size;
size_t chunk_len, actual;
int ret;
u8 cmd[4];
u8 cmd[4], bank_sel;
page_size = flash->page_size;
page_addr = offset / page_size;
byte_addr = offset % page_size;
ret = spi_claim_bus(flash->spi);
if (ret) {
@ -88,6 +86,16 @@ int spi_flash_cmd_write_multi(struct spi_flash *flash, u32 offset,
cmd[0] = CMD_PAGE_PROGRAM;
for (actual = 0; actual < len; actual += chunk_len) {
bank_sel = offset / SPI_FLASH_16MB_BOUN;
ret = spi_flash_cmd_bankaddr_write(flash, bank_sel);
if (ret) {
debug("SF: fail to set bank%d\n", bank_sel);
return ret;
}
page_addr = offset / page_size;
byte_addr = offset % page_size;
chunk_len = min(len - actual, page_size - byte_addr);
if (flash->spi->max_write_size)
@ -117,11 +125,7 @@ int spi_flash_cmd_write_multi(struct spi_flash *flash, u32 offset,
if (ret)
break;
byte_addr += chunk_len;
if (byte_addr == page_size) {
page_addr++;
byte_addr = 0;
}
offset += chunk_len;
}
spi_release_bus(flash->spi);
@ -204,9 +208,9 @@ int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout)
int spi_flash_cmd_erase(struct spi_flash *flash, u32 offset, size_t len)
{
u32 end, erase_size;
u32 erase_size;
int ret;
u8 cmd[4];
u8 cmd[4], bank_sel;
erase_size = flash->sector_size;
if (offset % erase_size || len % erase_size) {
@ -224,11 +228,17 @@ int spi_flash_cmd_erase(struct spi_flash *flash, u32 offset, size_t len)
cmd[0] = CMD_ERASE_4K;
else
cmd[0] = CMD_ERASE_64K;
end = offset + len;
while (offset < end) {
while (len) {
bank_sel = offset / SPI_FLASH_16MB_BOUN;
ret = spi_flash_cmd_bankaddr_write(flash, bank_sel);
if (ret) {
debug("SF: fail to set bank%d\n", bank_sel);
return ret;
}
spi_flash_addr(offset, cmd);
offset += erase_size;
debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
cmd[2], cmd[3], offset);
@ -244,6 +254,9 @@ int spi_flash_cmd_erase(struct spi_flash *flash, u32 offset, size_t len)
ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT);
if (ret)
goto out;
offset += erase_size;
len -= erase_size;
}
out: